If that is not some sort of weird compression fitting with NPT threads, it could be British Standard Pipe or GIC threaded compression fitting (dont know the acronym). Both of these I have found at our local hydraulics shop. Careful you dont get brass fittings because thats what GIC usually comes in (at least whats in the box in our shop)

Thats cool if I can use O2 regulator because I know where there is one in the plant and it's just like new. I think the intake gauge reads up to 4000psi but I think the outlet gauge only goes up to 100psi. Can I change the gauge to one that reads say 200psi or does it not work that way.

I think my best plan is to take the tank with me to a supply store because I know the O2 regulator does not have the right intake connector.

I want to thank everyone who has help me get one step closer to finishing my biggest cannon I have ever made. I can't wait to start shotting those spuds in to orbit

I will post pictures when it's done but I still have a few more parts to get and a lot of reading to do. I believe in going in to things like this with all the knowledge I can for the safety of my friends and myself.

EDIT: Forgot to add this to help identify the valve don't know if this will help it the markings on the tank.

CTC/DOT- 3ALM 1800-R
CCL 96318
WK10A85/20 CO2
1S90
1224002

On the safety label at the bottom it looks like the tank came from a company called Canadian Liquid Air, going to look them up on Google

meh go buy a proper regulator man you gonna want the 300+psi output mark and i wouldn't try it with something not rated that high, as i have heard from a certain person registered on this site, regulators when they blow apart tickle....*hurt like hell*.

i wouldn't risk it mate with these pressures i would take safety into consideration.

My regulator problems are solved I picked up a Harris 8700 high pressure regulator from work. It's rated to deliver output up to 1500 PSI, would love to see a pneumatic cannon that could shoot at 1500 PSI that would be insane. I still need to change the hookup to connect it to my tank, I'm going to try a CGA 320 as Da Pneu Kid thinks it might be. If it is wrong it's easier to carry a small part back and forth to the store then a 50LB tank.

I'm so close now all that is left is 4 or 5 fittings some clue, I'm hoping to be done in a couple of weeks can't wait

A welding supply store wil havel an adapter to mount your argon regulator on the CO2 tank. You could also get a new inlet fitting for a CO2 regulator and put it on an oxygen regulator, the inlet of both should be 1/4" npt.

kansasfarmer wrote:A welding supply store wil havel an adapter to mount your argon regulator on the CO2 tank. You could also get a new inlet fitting for a CO2 regulator and put it on an oxygen regulator, the inlet of both should be 1/4" npt.